'Merge two table,same column with empty values

Two datatables having same columns, unable to merge the table.

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Getting error message - 
**DataExceptionion was caught**
<target>.EmployeeID and <source>.EmployeeID have conflicting properties: DataType property mismatch.

Code:

dttemp = table1.Copy();
dttemp.Merge(table2);

How to merge two tables(null values)



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Source: Stack Overflow

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