Workflow activities

Last updated Feb 19, 2026

LookUpDataTable

This method emulates the behaviour of the VLOOKUP Excel formula. It enables you to search for a provided value in a specified DataTable and returns the RowIndex at which it was found. If the provided value is not found, then the returned RowIndex is -1. This method can also help you return the value found in the cell that has the row coordinates specified in the RowIndex parameter and the column coordinates specified in the Target Column property category.

Definition

Namespace: UiPath.Activities.System.API

Assembly: UiPath.System.Activities.Api (in UiPath.System.Activities.Api.dll)

Overloads


`LookUpDataTable(DataTable, String, String, String)`	It enables you to search for a provided value in a specified `DataTable` and returns the RowIndex at which it was found.
`LookUpDataTable(DataTable, String, String, String, Int32)`	It enables you to search for a provided value in a specified `DataTable` and returns the RowIndex at which it was found, and allows you to input the row number of the found cell.

`LookUpDataTable(DataTable, String, String, String)`

It enables you to search for a provided value in a specified DataTable and returns the RowIndex at which it was found.

Object LookupDataTable(
    DataTable dataTable,
    string lookupValue,
    string lookupColumnName,
    string targetColumnName
)
Object LookupDataTable(
    DataTable dataTable,
    string lookupValue,
    string lookupColumnName,
    string targetColumnName
)

dataTable DataTable : The DataTable in which the lookup is performed.

lookupValue String : The value you want to search for in the DataTable.

lookupColumnName String : The name of the column you want to search for in the DataTable set above.

targetColumnName String : Returns the value of the cell found at the coordinates between this column and the value from the RowIndex parameter. If the target column is not set the cell value is null.

`LookUpDataTable(DataTable, String, String, String, Int32)`

It enables you to search for a provided value in a specified DataTable and returns the RowIndex at which it was found, and allows you to input the row number of the found cell.

Object LookupDataTable(
    DataTable dataTable,
    string lookupValue,
    string lookupColumnName,
    string targetColumnName,
    out int rowIndex
)
Object LookupDataTable(
    DataTable dataTable,
    string lookupValue,
    string lookupColumnName,
    string targetColumnName,
    out int rowIndex
)

dataTable DataTable : The DataTable in which the lookup is performed.

lookupValue String : The value you want to search for in the DataTable.

lookupColumnName String : The name of the column you want to search for in the DataTable set above.

rowIndex Int32 : The Row index of the found cell, stored in an Int32 variable. If the provided value is not found, the Row index is -1.

Return value

Object

The value found in the cell that has the Row coordinates specified in the RowIndex property and the Column coordinates specified in the Target Column property category. The output type matches the source data type.

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